/* * BMP image format encoder * Copyright (c) 2006, 2007 Michel Bardiaux * Copyright (c) 2009 Daniel Verkamp <daniel at drv.nu> * * This file is part of Libav. * * Libav is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * Libav is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "libavutil/imgutils.h" #include "avcodec.h" #include "bytestream.h" #include "bmp.h" static const uint32_t monoblack_pal[] = { 0x000000, 0xFFFFFF }; static const uint32_t rgb565_masks[] = { 0xF800, 0x07E0, 0x001F }; static const uint32_t rgb444_masks[] = { 0x0F00, 0x00F0, 0x000F }; static av_cold int bmp_encode_init(AVCodecContext *avctx){ BMPContext *s = avctx->priv_data; avcodec_get_frame_defaults((AVFrame*)&s->picture); avctx->coded_frame = (AVFrame*)&s->picture; switch (avctx->pix_fmt) { case PIX_FMT_BGR24: avctx->bits_per_coded_sample = 24; break; case PIX_FMT_RGB555: case PIX_FMT_RGB565: case PIX_FMT_RGB444: avctx->bits_per_coded_sample = 16; break; case PIX_FMT_RGB8: case PIX_FMT_BGR8: case PIX_FMT_RGB4_BYTE: case PIX_FMT_BGR4_BYTE: case PIX_FMT_GRAY8: case PIX_FMT_PAL8: avctx->bits_per_coded_sample = 8; break; case PIX_FMT_MONOBLACK: avctx->bits_per_coded_sample = 1; break; default: av_log(avctx, AV_LOG_INFO, "unsupported pixel format\n"); return -1; } return 0; } static int bmp_encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){ BMPContext *s = avctx->priv_data; AVFrame *pict = data; AVFrame * const p= (AVFrame*)&s->picture; int n_bytes_image, n_bytes_per_row, n_bytes, i, n, hsize; const uint32_t *pal = NULL; int pad_bytes_per_row, pal_entries = 0, compression = BMP_RGB; int bit_count = avctx->bits_per_coded_sample; uint8_t *ptr; unsigned char* buf0 = buf; *p = *pict; p->pict_type= AV_PICTURE_TYPE_I; p->key_frame= 1; switch (avctx->pix_fmt) { case PIX_FMT_RGB444: compression = BMP_BITFIELDS; pal = rgb444_masks; // abuse pal to hold color masks pal_entries = 3; break; case PIX_FMT_RGB565: compression = BMP_BITFIELDS; pal = rgb565_masks; // abuse pal to hold color masks pal_entries = 3; break; case PIX_FMT_RGB8: case PIX_FMT_BGR8: case PIX_FMT_RGB4_BYTE: case PIX_FMT_BGR4_BYTE: case PIX_FMT_GRAY8: ff_set_systematic_pal2((uint32_t*)p->data[1], avctx->pix_fmt); case PIX_FMT_PAL8: pal = (uint32_t *)p->data[1]; break; case PIX_FMT_MONOBLACK: pal = monoblack_pal; break; } if (pal && !pal_entries) pal_entries = 1 << bit_count; n_bytes_per_row = ((int64_t)avctx->width * (int64_t)bit_count + 7LL) >> 3LL; pad_bytes_per_row = (4 - n_bytes_per_row) & 3; n_bytes_image = avctx->height * (n_bytes_per_row + pad_bytes_per_row); // STRUCTURE.field refer to the MSVC documentation for BITMAPFILEHEADER // and related pages. #define SIZE_BITMAPFILEHEADER 14 #define SIZE_BITMAPINFOHEADER 40 hsize = SIZE_BITMAPFILEHEADER + SIZE_BITMAPINFOHEADER + (pal_entries << 2); n_bytes = n_bytes_image + hsize; if(n_bytes>buf_size) { av_log(avctx, AV_LOG_ERROR, "buf size too small (need %d, got %d)\n", n_bytes, buf_size); return -1; } bytestream_put_byte(&buf, 'B'); // BITMAPFILEHEADER.bfType bytestream_put_byte(&buf, 'M'); // do. bytestream_put_le32(&buf, n_bytes); // BITMAPFILEHEADER.bfSize bytestream_put_le16(&buf, 0); // BITMAPFILEHEADER.bfReserved1 bytestream_put_le16(&buf, 0); // BITMAPFILEHEADER.bfReserved2 bytestream_put_le32(&buf, hsize); // BITMAPFILEHEADER.bfOffBits bytestream_put_le32(&buf, SIZE_BITMAPINFOHEADER); // BITMAPINFOHEADER.biSize bytestream_put_le32(&buf, avctx->width); // BITMAPINFOHEADER.biWidth bytestream_put_le32(&buf, avctx->height); // BITMAPINFOHEADER.biHeight bytestream_put_le16(&buf, 1); // BITMAPINFOHEADER.biPlanes bytestream_put_le16(&buf, bit_count); // BITMAPINFOHEADER.biBitCount bytestream_put_le32(&buf, compression); // BITMAPINFOHEADER.biCompression bytestream_put_le32(&buf, n_bytes_image); // BITMAPINFOHEADER.biSizeImage bytestream_put_le32(&buf, 0); // BITMAPINFOHEADER.biXPelsPerMeter bytestream_put_le32(&buf, 0); // BITMAPINFOHEADER.biYPelsPerMeter bytestream_put_le32(&buf, 0); // BITMAPINFOHEADER.biClrUsed bytestream_put_le32(&buf, 0); // BITMAPINFOHEADER.biClrImportant for (i = 0; i < pal_entries; i++) bytestream_put_le32(&buf, pal[i] & 0xFFFFFF); // BMP files are bottom-to-top so we start from the end... ptr = p->data[0] + (avctx->height - 1) * p->linesize[0]; buf = buf0 + hsize; for(i = 0; i < avctx->height; i++) { if (bit_count == 16) { const uint16_t *src = (const uint16_t *) ptr; uint16_t *dst = (uint16_t *) buf; for(n = 0; n < avctx->width; n++) AV_WL16(dst + n, src[n]); } else { memcpy(buf, ptr, n_bytes_per_row); } buf += n_bytes_per_row; memset(buf, 0, pad_bytes_per_row); buf += pad_bytes_per_row; ptr -= p->linesize[0]; // ... and go back } return n_bytes; } AVCodec ff_bmp_encoder = { .name = "bmp", .type = AVMEDIA_TYPE_VIDEO, .id = CODEC_ID_BMP, .priv_data_size = sizeof(BMPContext), .init = bmp_encode_init, .encode = bmp_encode_frame, .pix_fmts = (const enum PixelFormat[]){ PIX_FMT_BGR24, PIX_FMT_RGB555, PIX_FMT_RGB444, PIX_FMT_RGB565, PIX_FMT_RGB8, PIX_FMT_BGR8, PIX_FMT_RGB4_BYTE, PIX_FMT_BGR4_BYTE, PIX_FMT_GRAY8, PIX_FMT_PAL8, PIX_FMT_MONOBLACK, PIX_FMT_NONE}, .long_name = NULL_IF_CONFIG_SMALL("BMP image"), };